<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary" @click="dialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" 
                            v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">
                                    {{ item1.authName }}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19" >
                                <!-- 通过for循环嵌套渲染二级权限 -->
                               <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" 
                                v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success" 
                                        closable @close="removeRightById(scope.row, item2.id)">
                                            {{ item2.authName }}
                                    </el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <el-tag closable 
                                        @close="removeRightById(scope.row, item3.id)" 
                                        type="warning" v-for="item3 in item2.children" 
                                        :key="item3.id">
                                        {{ item3.authName }}
                                    </el-tag>
                                </el-col>
                               </el-row>
                            </el-col>
                        </el-row>
                        <pre>
                            {{ scope.row }}
                        </pre>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column label="#" type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" 
                            @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>

            <!-- 添加角色的对话框 -->
            <el-dialog
                title="添加角色"
                :visible.sync="dialogVisible"
                width="30%">
                <!-- 内容主体区域 -->
                <el-form ref="addRoleFormRef" :model="addRoleForm"  label-width="70px" >
                    <el-form-item label="角色名称">
                        <el-input v-model="addRoleForm.roleName"></el-input>
                    </el-form-item>
                    <el-form-item label="角色详情">
                        <el-input v-model="addRoleForm.roleDesc"></el-input>
                    </el-form-item>
                </el-form>

                <span slot="footer" class="dialog-footer">
                    <el-button @click="dialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="dialogVisible = false">确 定</el-button>
                </span>
            </el-dialog>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed"
            >
            <!-- 树形控件 -->
            <el-tree :data="rightslist" 
                :props="treeProps" 
                show-checkbox node-key="id" 
                default-expand-all
                :default-checked-keys="defkeys"
                ref="treeRef" 
                >
            </el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
            return {
                // 所有角色列表数据
                rolelist: [],
                dialogVisible: false,
                addRoleForm: {
                    roleName: '',
                    roleDesc: ''
                },
                // 控制分配权限对话框的显示与隐藏
                setRightDialogVisible: false,
                // 所有权限的数据
                rightslist: [],
                // 树形控件的属性绑定对象
                treeProps: {
                    label: 'authName',
                    children: 'children'
                },
                // 默认选中的节点Id值数组
                defkeys: [],
                // 当前即将分配的权限id值
                roleId: ''
            }
        },
        created(){
            this.getRolesList();
        },
        methods:{
            // 获取所有角色的列表
            async getRolesList(){
                const {data: res} = await this.$http.get('roles');

                if(res.meta.status !== 200){
                    return this.$message.error('获取角色列表失败!');
                }
                this.rolelist = res.data;
                console.log(this.rolelist);
            },

            // 根据Id删除对应的权限
            async removeRightById(role, rightId){
                //弹框提示用户是否删除用户
                const confirmResult = await this.$confirm(
                    '此操作将永久删除该文件, 是否继续?', 
                    '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err);

                if(confirmResult !== 'confirm') {
                    return this.$message.info('取消了删除!');
                }
                
                const {data: res} = 
                    await this.$http.delete(`roles/${role.id}/rights/${rightId}`);

                if(res.meta.status !== 200) {
                    return this.$message.error('删除权限失败!');
                }
                // 页面重新渲染
                // this.getRolesList();
                role.children = res.data;

            },

            // 展示分配权限的对话框
            async showSetRightDialog(role){
                // 将当前角色id保存到数据中
                this.roleId = role.id;
                // 获取所有权限的数据
                const {data: res} = await this.$http.get('rights/tree');

                if(res.meta.status !== 200){
                    return this.$message.error('获取权限数据失败');
                }
                // 把获取到的权限数据保存到data中
                this.rightslist = res.data;
                console.log(this.rightslist);

                // 递归获取三级节点的id
                this.getLeafKeys(role, this.defkeys)

                this.setRightDialogVisible = true;
            },

            // 通过递归的形式, 获取角色下所有三级权限的id, 
            // 并保存到defkeys数组中
            getLeafKeys(node, arr){
                // 如果当前node节点不包含children属性, 则是三级节点
                if(!node.children) {
                    return arr.push(node.id);
                }

                node.children.forEach(item => this.getLeafKeys(item, arr));
            },

            // 监听分配权限对话框的关闭事件
            setRightDialogClosed (){
                this.defkeys = [];
            },
            // 点击为角色分配权限
            async allotRights(){
                const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
                ];
                const idStr = keys.join(',');

                const {data: res} = 
                    await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr});
                
                if(res.meta.status !== 200) {
                    return this.$message.error('更新权限失败!');
                }

                this.$message.success('更新权限成功!');
                this.getRolesList();

                this.setRightDialogVisible = false;
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-tag {
        margin: 7px;
    }

    .bdtop {
        border-top: 1px solid #eee;
    }
    
    .bdbottom {
        border-bottom: 1px solid #eee;
    }

    .vcenter {
        display: flex;
        align-items: center;
    }
</style>